电石渣处理洗煤废水的效果及作用机理研究

Study on mechanism of coal-washing wastewater treatment effect and action with carbide slag

为了防止洗煤废水的污染并使之处理后能够回用 ,开展了电石渣— PAM(聚丙烯酰胺 )处理洗煤废水小试实验研究以及实际工程应用的研究 ,并通过实验与理论分析 ,对电石渣处理洗煤废水的作用机理进行研究。实验研究结果以及实际工程应用效果表明 ,采用电石渣— PAM混凝沉淀法处理洗煤废水具有较好的处理效果 ,处理后煤泥水的各项指标均能达到国家排放标准 ,且能满足洗煤工艺的用水要求。实验研究与理论分析结果表明 ,电石渣对洗煤废水的混凝作用不是补给了 OH- ,而是提供了大量的 Ca2 +,Ca2 +通过压缩双电层 ,破坏了煤泥颗粒的稳定性 ,从而使煤泥颗粒发生凝聚 ,OH- 和 Ca(OH )

The present paper aims to introduce the author's study on treating coal-washing wastewater with carbide slag and PAM coagulants for reducing wastewater pollution and its recycled use through treatment both in lab- and full-scale experiment. Our experiment results show that the carbide slag-PAM is highly efficient in coal-washing wastewater treatment in full conformity with the state Wastewater Discharge and Recycled Use Standards. The experiment results and the corresponding theoretical analyses also indicate that the coagulation mechanism of wastewater with carbide slag is able to provide sufficient Ca^(2+)instead of OH^-. The provided Ca^(2+) is coagulated with coal slime through double-layer compressing to make the coal slime destabilized. However, both OH^-and Ca(OH)_2 do not play any important role in coal washing wastewater. Meanwhile, the coagulation mechanism is also investigated.